CN1004914B - Power circuit device for television receiver - Google Patents
Power circuit device for television receiver Download PDFInfo
- Publication number
- CN1004914B CN1004914B CN85106900.2A CN85106900A CN1004914B CN 1004914 B CN1004914 B CN 1004914B CN 85106900 A CN85106900 A CN 85106900A CN 1004914 B CN1004914 B CN 1004914B
- Authority
- CN
- China
- Prior art keywords
- circuit
- switch mode
- power
- mode power
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
- H04N3/185—Maintaining dc voltage constant
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Television Receiver Circuits (AREA)
- Details Of Television Scanning (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model relates to switch type power supply used for a TV device; wherein, a preliminary terminal of the power supply is provided with a protecting circuit to prevent overloading; a sublevel terminal of the power supply is provided with an adjuster circuit and a communicating circuit as well as a circuit for cutting off an ultimate power supply. The switch circuit of the preliminary terminal reacting to the faults leads to a negative voltage phase movement of the sublevel terminal. The negative voltage phase movement is compared with the sublevel (standby) voltage phase independently generated in the switch type power supply in a comparator, therefore, a control voltage is provided and is positioned at the protecting circuit reaction of the sublevel terminal, and also the switch control of the power supply part is cut off.
Description
The present invention relates to a kind of power circuit device that is used for television receiver, this device has the line frequency synchronous with switch mode power.
It is on record being used for to the circuit at different levels in the communication Instrument (for example, supply voltage utilizes the television receiver of switch mode power) provide the method for required operating voltage, (Funkschau1975, the 5th, 40～41 pages).The easier receiver circuit that makes of switch mode power is opened with isolated from power, and helps the connection with Other Instruments, also helps protectiveness and isolates.Because switch mode power just can be dwindled so be used for the transformer of electricity isolation widely to be higher than the frequency work of power supply, and also lighter than the structure of the power transformer of working with 50HZ.The operating voltage of different sizes and polarity can provide with some coils or branch road and the rectifier that is connected switch mode power transformer secondary output end.
For synchronous switch mode power, regulating circuit can be installed in secondary end, and control circuit and protective circuit are installed in primary side.A kind of like this power supply needs the coupling element of an isolated from power, optical coupler just, like this, for example guaranteeing that adjusting information also can be sent to primary side under the situation that electricity is isolated, this point is very important, that is, if the deviation of supply voltage must keep constant, otherwise, if do not regulate, the result who modulates as the audio frequency output stage will change.This unfavorable conditions (occurring with extra cost at the beginning) but is compensated with following result.Be that the easier elimination of synchro switch formula power supply is disturbed, because the load variations of asynchronous switch mode power has caused the variation of switching frequency, and switching frequency keeps invariable to synchro switch formula power supply, that is to say, it is with line frequency work, or operating frequency harmony unanimity.
For control switch formula power supply has designed a kind of integrated circuit (TEA2026), this circuit comprises a protective circuit, and it disconnects instrument under situation about breaking down.This protective circuit is to work on the basis of pulse-width modulator, and modulator provides control impuls for the switch of linking primary side by optical coupler.The switching circuit that is arranged in integrated circuit after removing fault, release pulses width modulator once more, like this, by the output control pulse signal, (pulsewidth of this pulse signal begin narrower then increase gradually) makes switch mode power conducting gradually.Except this protective circuit, also have an overload protection arrangement at primary side, when the electric current by switching transistor reached limiting value, it can cut off the control of switching transistor.When at present, also being difficult to obtain the switch mode power secondary end and increasing collector current for information about.Because the protective circuit that is used for finally ending is at this end.For example this information can transmit by an isolating transformer, perhaps solves by means of another optical coupler.But this needs extra cost again.
The present invention is its basis with the problem of finding out below solving, and is about to fault message and is sent to the switch mode power secondary end, but avoid extra buffer circuit simultaneously again.
Below, with reference to the accompanying drawings embodiment of the present invention is narrated.
1. the transformer of representation switch formula power supply, it has a primary coil 2, an end of primary coil 2 and supply voltage U＜`; ; B`〉an end link, supply voltage is by power rectifier 3 rectifications, and by capacitor 4 it become smoothly, supply voltage U＜`; ; B`〉the other end link on the negative pole of power rectifier 3 by transistor 5 and one inspection leakage resistance 6.Transistor 5 is controlled by another primary coil 7 of transformer 1.Coil 7 be connected in parallel by the switch 8 of the pulse regulation of width modulated.In case switch 8 not conductings, transistor 5 is just with conducting, and vice versa.Owing to the result who replaces open and close with pulse frequency, the voltage that is produced has passed to the secondary end of transformer 1, and like this, secondary coil 9,10 and 11 secondary voltage U＜` occurred by rectifier 12,13 and 14 on capacitor 15,16 and 17; ; 1` 〉, U＜`; ; 2`〉and U＜`; ; 3` 〉.Duration-modulated pulse produces by control circuit 18, arrive the control electrode of switch 8 by optical coupler 19, these pulses are produced by a pulse-width modulator 20 in a well-known manner, in modulator, produce a line frequency saw-tooth voltage 21 with the oscillator that does not have depicted in greater detail to go out among the figure, on the isolated from power end of switch mode power, the voltage that this line frequency saw-tooth voltage and switch mode power produce (is U＜`; ; 3` 〉) compare.This voltage is adjusted by voltage divider 22.After amplifying in amplifier, pulse is sent to optical coupler 19.Switching circuit 24 is positioned at control circuit 18, and it has and guarantees that when switch mode power was connected, pulse was begun to increase at leisure the function of institute's regulated value by the pulse duration of minimum.Control circuit 18 also contains a protective circuit 25, and it can be subjected to influence at some fault messages that secondary end occurs.For example, flash for TV image, overtension or electric current are crossed and strong etc. are all responded.These inputs are symbolically represented with 26.Under situation about breaking down, pulse-width modulator 20 is disconnected.After a period of time by timing circuit 27 decisions postponed, switching circuit 24 was switched on again, and like this, switch mode power has gently started again, and at the power end of switch mode power, isolating points symbolically by straight line 28 expressions, also has an overload protection.Electric current by transistor 5 can be measured comes out, and when the value of overstepping the extreme limit, resistance 6 produces a voltage drop, and it applies a voltage by diode 29 to electric capacity 30, and this makes switch 8 conductings, like this transistor 5 stop conducting at once.A kind of like this critical condition of overload must pass to the isolated from power end of switch mode power at once, can respond so that be positioned at the protective circuit 25 at control circuit 18 places, and the assurance switch mode power can slowly be connected.For fault message being passed to the isolated from power end, utilized such fact, promptly under out of order situation, all secondary voltages all experience the conversion of a negative voltage.So one of them secondary voltage that is produced is as U＜`; ; 1` 〉, to be linked by an electric capacity 31 on the input of comparator 32, another input of comparator links to each other with a constant voltage, this voltage, for example 5 volts, can from one independently transformer 33 there obtain, this transformer 33 is to be prepared for doing the television receiver remote control to use.This voltage, by rectifier 34 rectifications, capacitor 35 filtering by resistance 36, make it keep stable by Zener diode 37, and its benchmark as a comparison sends second input of comparator 32 to.In case the voltage by capacitor 31 is the negative voltage signal that is positioned at below the reference voltage, comparator just discharges a pulse, and its passing threshold discriminator 38 starts protective circuit 25, so switch mode power is disconnected.
In switching circuit 24, also can add a counter, so that the number of times that meter is connected down continuously after disconnection.The control of last power supply disconnects and can occur in after a certain given number, can protect for this reason like this and the equipment of work, also can eliminate the fire that may cause owing to the work of element overload.
The symbol diagram table of T-PA531
1. transformer 20. pulse-width modulators
2. primary coil 21. saw-tooth voltages
3. power rectifier 22. voltage dividers
4. capacitor 23. amplifiers
5. transistor 24. switching circuits
6. resistance 25. protective circuits
7. primary coil 26. control inputs
8. switch 27. timing circuits
9. secondary coil 28. isolating points
10. secondary coil 29. rectifiers
11. secondary coil 30. capacitors
12. rectifier 31. capacitors
13. rectifier 32. capacitors
14. rectifier 33. transformers
15. capacitor 34. power rectifiers
16. capacitor 35. capacitors
17. capacitor 36. resistance
18. control unit 37. zener diodes
19. optical coupler 38. threshold discriminator
Claims (2)
1, the power circuit device that is used for television receiver.This device has and is used for the line frequency of the switch mode power synchronised that receiver and power supply is isolated; Is furnished with a protective circuit that prevents to transship at the primary side of switch mode power; a secondary end regulating circuit; it comprises a protective circuit (25) of moving in response to fault message with break impulse width modulator (20); this regulating circuit is by an isolated from power coupling element and utilize the switch triode that is positioned at primary side by the determined duration-modulated pulse driving of load; it is characterized in that; add to an input of comparator (32) by a secondary voltage of switch mode power generation; by being independent of another input that comparative voltage that switch mode power produces adds to comparator; when the overload protecting circuit of primary side causes in the pressure drop of comparator input terminal place generation secondary electrical; comparator circuit (32) is signal of described secondary end protective circuit output; produce after certain delay by the drive circuit (24) that is used for driving switch formula power supply, thereby described drive circuit is connected the switch mode power startup work that makes once more.
According to the circuit arrangement of claim 1, it is characterized in that 2, the voltage that is independent of switch mode power is by the power unit generation that is used for producing auxiliary voltage.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3436555.9 | 1984-10-05 | ||
| DE19843436555 DE3436555A1 (en) | 1984-10-05 | 1984-10-05 | CIRCUIT FOR THE POWER SUPPLY OF A TELEVISION RECEIVER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85106900A CN85106900A (en) | 1987-09-02 |
| CN1004914B true CN1004914B (en) | 1989-07-26 |
Family
ID=6247180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85106900.2A Expired CN1004914B (en) | 1984-10-05 | 1985-09-14 | Power circuit device for television receiver |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0197045B1 (en) |
| JP (1) | JPS61179677A (en) |
| KR (1) | KR920007155B1 (en) |
| CN (1) | CN1004914B (en) |
| AT (1) | ATE51734T1 (en) |
| DE (2) | DE3436555A1 (en) |
| DK (1) | DK165036C (en) |
| WO (1) | WO1986002220A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3723484A1 (en) * | 1987-07-16 | 1989-01-26 | Thomson Brandt Gmbh | SWITCHING POWER SUPPLY |
| DE3601738A1 (en) * | 1986-01-22 | 1987-07-23 | Thomson Brandt Gmbh | SWITCHING POWER SUPPLY FOR A REMOTE-CONTROLLED DEVICE |
| US4656573A (en) * | 1986-05-12 | 1987-04-07 | Rca Corporation | Power supply having on-off control |
| ITMI911744A1 (en) * | 1990-08-27 | 1991-10-03 | Thomson Consumer Electronics | DEACTIVATION SYSTEM IN A TELEVISION RECEIVER |
| DE4244530A1 (en) * | 1992-12-30 | 1994-07-07 | Thomson Brandt Gmbh | Protected power supply circuit for TV receiver in standby mode |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4330816A (en) * | 1980-01-02 | 1982-05-18 | Fujitsu Fanuc Limited | Overcurrent protection apparatus |
-
1984
- 1984-10-05 DE DE19843436555 patent/DE3436555A1/en not_active Withdrawn
-
1985
- 1985-09-10 EP EP85904449A patent/EP0197045B1/en not_active Expired - Lifetime
- 1985-09-10 WO PCT/EP1985/000456 patent/WO1986002220A1/en active IP Right Grant
- 1985-09-10 DE DE8585904449T patent/DE3577027D1/en not_active Expired - Fee Related
- 1985-09-10 AT AT85904449T patent/ATE51734T1/en not_active IP Right Cessation
- 1985-09-10 KR KR1019860700293A patent/KR920007155B1/en not_active IP Right Cessation
- 1985-09-14 CN CN85106900.2A patent/CN1004914B/en not_active Expired
- 1985-10-04 JP JP60220503A patent/JPS61179677A/en active Granted
-
1986
- 1986-06-04 DK DK265186A patent/DK165036C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3577027D1 (en) | 1990-05-10 |
| DE3436555A1 (en) | 1986-04-10 |
| WO1986002220A1 (en) | 1986-04-10 |
| KR920007155B1 (en) | 1992-08-27 |
| ATE51734T1 (en) | 1990-04-15 |
| EP0197045B1 (en) | 1990-04-04 |
| KR880700585A (en) | 1988-03-15 |
| DK265186A (en) | 1986-06-04 |
| DK165036C (en) | 1993-02-08 |
| EP0197045A1 (en) | 1986-10-15 |
| CN85106900A (en) | 1987-09-02 |
| JPH0433191B2 (en) | 1992-06-02 |
| DK165036B (en) | 1992-09-28 |
| DK265186D0 (en) | 1986-06-04 |
| JPS61179677A (en) | 1986-08-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |